The HI 93703 portable microprocessor-based turbidity meter provides lab-grade accuracy even in the field. With 4 keys and weighing only 350 grams, HI 93703 measures turbidity from 0 to 1000 FTU (NTU)*. For best field accuracy, it measures from 0 to 50 FTU in steps of 1/100th of FTU. HI 93703 is equipped with an infrared LED as source of light. The wavelength peaks at 890 nm, which provides the required intensity of diffused light even in samples with low turbidity values, and also reduces the interference from any colors. The meter is very easy to use. All operations can be carried out with only four keys and troubleshooting functions can be performed with error code on LCD. Sensitive to the user's need to work with properly calibrated meters, Hanna Instruments has equipped HI 93703 with a unique GLP (Good Laboratory Practice) feature. GLP circuitry automatically stores and retrieves the last calibration data. At the touch of a key, the last calibration data together with time and date are displayed allowing the user to maintain an accurate calibration schedule. Auto shut-off turns the meter off after 5 minutes of non-use to save batteries.